Radio IC device and radio communication terminal

• US 8,740,093 B2
• Filed: 09/04/2013
• Issued: 06/03/2014
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru
• Primary Examiner(s): Savusdiphol, Paultep
• Application Number:
  US14/017,406
• Publication Number:
  US 20140001274A1
• Time in Patent Office: 272 Days
• Field of Search: 235/487, 235/492
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/07754 the connection being galvanic
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

A radio IC device includes a radio IC element arranged to process a high-frequency signal, a substrate on which the radio IC element is mounted, a planar conductor arranged on a first surface of the substrate, and a first wiring electrode and a second wiring electrode including respective first ends connected to a pair of input/output electrodes of the radio IC element. The first wiring electrode and the second wiring electrode are arranged on a second surface of the substrate, the second surface being parallel or substantially parallel to the first surface and including respective second ends electrically connected to the planar conductor, and defining loops when looking at the substrate from X-, Y- and Z-directions orthogonal to one another.

Claims

1. A radio IC device comprising:

a radio IC element arranged to process a high-frequency signal;

a substrate on which the radio IC element is mounted;

a planar conductor arranged on a first surface of the substrate; and

a first wiring electrode and a second wiring electrode including respective first ends connected to a pair of input/output electrodes of the radio IC element;

wherein

the first wiring electrode and the second wiring electrode are arranged on a second surface of the substrate, the second surface being parallel or substantially parallel to the first surface, and including respective second ends electrically connected to the planar conductor; and

the first wiring electrode and the second wiring electrode define loops when looking at the substrate from X-, Y- and Z-directions orthogonal to one another.

2. The radio IC device according to claim 1, wherein a capacitance is provided between one end of the first wiring electrode and the planar conductor.

3. The radio IC device according to claim 2, wherein a capacitive element is connected between the first wiring electrode and the second wiring electrode.

4. The radio IC device according to claim 2, wherein

the radio IC element includes a radio IC chip arranged to process a high-frequency signal, and a feeder circuit board including a feeder circuit having a predetermined resonance frequency;

and

the feeder circuit board includes two inductance elements.

5. The radio IC device according to claim 1, wherein a portion of the planar electrode opposite to the first wiring electrode is a cut-out portion having a recessed shape.

6. The radio IC device according to claim 5, wherein the cut-out portion with the recessed shape is arranged to have a relatively large width on a side close to an edge of the substrate and a relatively small width on a side which is perpendicular or substantially perpendicular to the side close to an edge of the substrate.

7. The radio IC device according to claim 6, wherein the first wiring electrode has a meandering shape.

8. The radio IC device according to claim 5, wherein the cut-out portion with the recessed shape is arranged to have a relatively small width on a side close to an edge of the substrate and a relatively large width on a side which is perpendicular or substantially perpendicular to the side close to an edge of the substrate.

9. The radio IC device according to claim 8, wherein a land portion of the first wiring electrode is displaced from the cut-out portion in a lateral direction and the second wiring electrode is arranged opposite to the displaced land portion in the lateral direction.

10. The radio IC device according to claim 5, wherein the cut-out portion with a recessed shape includes an additional cut-out portion arranged under the first wiring electrode and the second wiring electrode.

11. The radio IC device according to claim 10, wherein the additional cut-out portion overlaps an entirety of the first wiring electrode and only a portion of the second wiring electrode.

12. The radio IC device according to claim 1, wherein the first wiring electrode has a meandering shape.

13. The radio IC device according to claim 1, wherein a capacitive element is connected between the first wiring electrode and the second wiring electrode.

14. The radio IC device according to claim 1, wherein the radio IC element is arranged outside an entirety of the loop defined when viewed from the X-direction, the loop defined when viewed from the Y-direction, and the loop defined when viewed from the Z-direction.

15. The radio IC device according to claim 1, wherein the radio IC element is a radio IC chip arranged to process a high-frequency signal.

16. The radio IC device according to claim 1, wherein the radio IC element includes a radio IC chip arranged to process a high-frequency signal, and a feeder circuit board including a feeder circuit having a predetermined resonance frequency.

17. The radio IC device according to claim 16, wherein the feeder circuit board includes two inductance elements.

18. The radio IC device according to claim 17, wherein

the two inductance elements are arranged to generate magnetic fields;

and

the magnetic fields of respective ones of the two inductance elements are reversed.

19. A radio communication terminal including the radio IC device according to claim 1.

20. The radio IC device according to claim 1, wherein the first wiring electrode is arranged to extend over a portion of the substrate in which the planar conductor is not provided.